Help me with my build - Avatar of Fire EH Scion

Hey

I've been casually thinking about this build for some time now and I need some help.

It revolves around a Scion using Avatar of Fire together with elemental hit with wands. Wands has a very high critical strike chance, together with avatar of fire you should be able to burn down most packs of mobs with your attacks. Here's the build thus far:

http://www.pathofexile.com/passive-skill-tree/AAAAAgABA5YEBwSzBg4IZwn2DjwSaRRNFHEUsBZAFxwYPBpsHwIlrSj6KU8qjTIJMn4yiTWSNsU22DboOVI6MDpSOyg_c0rITLNObVAwVcZX4lgHWK9aUmBDY_1mnme9bEZuPW6qcXlybHbnd-V4DXjOgpuCx4MJhX2I8ZM6l4WbXZuhna6ezaIApwinMKiaqW6sWayYr4218riTvDe9J89l0NDTG9gk2wLkIuvu7DjsVe5v8pf31_no

* I use the curse keystone passives because I want to be able to use projectile weakness / flammability at the same time [Please tell me if this is necessary]

* I use iron grip in hope it will apply damage to my wand attacks [Necessary?]

I will probably be using wrath aura to add damage, maybe clarity, I'm not really sure what's necessary.

Elemental hit - Faster Attacks - lesser multiple projectiles - weapon elemental damage



The main problem I can see with this build is the lack of survivability. I usually make melee characters so I have no real clue how survivability works on ranged characters, let alone wanderers which I have no experience of whatsoever.

I've considered to maybe add some templar shield nodes, is this a good idea or no?

Please give me criticism, that's how I'll improve. What would you personally add, remove or fix? Maybe even change class is necessary?

Thanks in advance

bump